Hello,
My customer is asking about Reserved bit.
They face a problem three TLK110s isn’t started up.
They checked power up timing (t1(POR):270ms typ) and rise timing of between PFBOUT(1.55V) and AVDD33 but these timing was no problem.
(They use internal POR.)
They use single supply operation and checked decap capacitor value and voltage at PFBIN/OUT but these was no problem.
(Question)
They found out the following reserved bit of SWSCR2 and CDCR register are set “1” on problem devices
The normal devices are set “0” correctly. Of Course, They didn’t write to reserved bit, and read it only.
(Reserved bit “1” on problem devices)
SWSCR2:bit14~8
CDCR:bit6,bit7
(1) Are those bit settings related to started up problem?
(2) Why are those bit settings on problem devices?
(3) Are these devices in fail mode? Or should they request to Failure Analysis?
Regards,
Tao_2199